deduct (v.)

15世纪初，"在估算或计算中削减，分离或去除"，源自拉丁语 deductus，过去分词为 deducere，含义为 "降低，带走"，参见 deduce，与此前可以互换。Deduct 指的是撤回部分或数量； subtract 指的是撤消数字。相关： Deducted; deducting。

Deduct is to lead away, set aside, in a general or distributive sense; subtract, to draw off, remove, in a literal or collective sense. In settling a mercantile account, certain items, as charges, losses, etc. are deducted by being added together and their total subtracted from the grand total of the transaction. [Century Dictionary]

Deduct 是以一般或分配的意义来带走、搁置； subtract 是以字面或集体的意义来拿走、移除。在解决商业账户时，一些项，如费用、损失等通过将其相加并将其总计从交易总额中扣除来实现。